Engine paint on mating surfaces

[DupleDreux]

Hi Guys, never posted before, but this forum has really helped me keep my six running. thanks.

I just bought a rebuilt 200 long block and they painted it with duplicolor dark ford blue . They masked the mains and the valve area, but they painted over all the other mating areas like the exhaust ports, water pump, behind the timing chain, the oil filter and fuel pump mating surfaces. Before I get all crazy and wetsand these down, is it okay (or even good) to have a layer of paint in a sealed assembly?

I've got no experience with this, my old block (original?) has no paint on any mating surface.

thanks again

mark

1966 200 coupe, headers, 2100, DSII,

smooth as a jag
pulls stumps all day long
20 mpg

 

[JackFish]

They should have masked all gasket surfaces, I would think, but that takes time ($$). I would clean off all those surfaces.
Often the timing cover would be on for the paint job.
I also roll up little pieces of stiff paper and put 'em in the bolt holes.

 

[XFlow_Fairlane]

won't hurt anything. i woul dwipe down any area that sees oil with some lacquer thinner to get most the paint off it though. as long as there is not any paint on the headgasket surface you are good.

 

[DupleDreux]

Thanks jackfish, I was afraid of that.

Good tip about the bolt holes.

mark

 

[addo]

Don't wetsand anything - use paint stripper applied very carefully and specifically, then scraped and wiped off with a wet rag.

 

[DupleDreux]

Okay, I used a small amount of Jasco and it came right off, not anywhere as big a job as I thought.

thanks everyone again, and thanks for the tips on filling bolt holes and using stripper.

mark

66 mustang 200 coupe

smooth as a jag
pulls stumps all day long
20 mpg

works for me!

 

[shmoozo]

I've never actually tried this, but I wonder if this would work -- you know those small foam hearing protectors? The ones you sort of compress by rolling them between your fingers and your thumb and stick into your ears, and then they expand and fill your ear canal and make things really quiet?

Could you use those in bolt holes on something like an engine block to keep paint out of the holes?

 

[JackFish]

I've never actually tried this, but I wonder if this would work -- you know those small foam hearing protectors? The ones you sort of compress by rolling them between your fingers and your thumb and stick into your ears, and then they expand and fill your ear canal and make things really quiet?

Could you use those in bolt holes on something like an engine block to keep paint out of the holes?

The foam might hard to remove if the paint is absorbed, or reacts with it and melts it or makes it gluey.
I suppose bolts would work too.
But the roll of paper expands to fill the hole and comes out easily.

 

[XFlow_Fairlane]

even better solution for bolt holes.....run a tap in it so the threads are just clean. get a couple bottom taps (there are only a handful of sizes on the motor anyways) and tap everything clear down all the way.

 

[mceachrw]

i use earplugs all the time to plug up hydraulic manifolds that require machining. the EAR Classic Ear Plugs work best. they hold up well against acetone and mineral/synthetic hydraulic oils. they are also fairly tough and can be pulled out with picks or needle nose.